i would go straight from cuttings to flower.. i have flowered cuttings in a 6" pot from day 1 and ended up with a 12" long and about 2" man bud.. about 3 quarter ounce dry. it was bagseed... it was just an experiment.. could have been the strain cause most commercial shit is quick flowering.. but try it and see what works best.. u got to think u dont have mush room for veritcal growth.. and most plants double under flowering..